summaryrefslogtreecommitdiff
path: root/sys/dev/dm/dm_target.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/dev/dm/dm_target.c')
-rw-r--r--sys/dev/dm/dm_target.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/sys/dev/dm/dm_target.c b/sys/dev/dm/dm_target.c
new file mode 100644
index 00000000000..d1ab3f9e259
--- /dev/null
+++ b/sys/dev/dm/dm_target.c
@@ -0,0 +1,290 @@
+/* $NetBSD: dm_target.c,v 1.2 2008/12/19 15:24:03 haad Exp $ */
+
+/*
+ * Copyright (c) 2008 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Adam Hamsik.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code Must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#include <sys/kmem.h>
+
+#include "netbsd-dm.h"
+#include "dm.h"
+
+static dm_target_t* dm_target_alloc(const char *);
+
+TAILQ_HEAD(dm_target_head, dm_target);
+
+static struct dm_target_head dm_target_list =
+TAILQ_HEAD_INITIALIZER(dm_target_list);
+
+/*
+ * Search for name in TAIL and return apropriate pointer.
+ */
+dm_target_t*
+dm_target_lookup_name(const char *dm_target_name)
+{
+ dm_target_t *dm_target;
+ int dlen; int slen;
+
+ slen = strlen(dm_target_name)+1;
+
+ TAILQ_FOREACH (dm_target, &dm_target_list, dm_target_next) {
+ dlen = strlen(dm_target->name)+1;
+
+ if (dlen != slen)
+ continue;
+
+ if (strncmp(dm_target_name, dm_target->name, slen) == 0)
+ return dm_target;
+ }
+
+ return NULL;
+}
+
+/*
+ * Insert new target struct into the TAIL.
+ * dm_target
+ * contains name, version, function pointer to specifif target functions.
+ */
+int
+dm_target_insert(dm_target_t *dm_target)
+{
+ dm_target_t *dmt;
+
+ dmt = dm_target_lookup_name(dm_target->name);
+
+ if (dmt != NULL)
+ return EEXIST;
+
+ TAILQ_INSERT_TAIL(&dm_target_list, dm_target, dm_target_next);
+
+ return 0;
+}
+
+
+/*
+ * Remove target from TAIL, target is selected with it's name.
+ */
+int
+dm_target_rem(char *dm_target_name)
+{
+ dm_target_t *dm_target;
+
+ KASSERT(dm_target_name != NULL);
+
+ dm_target = dm_target_lookup_name(dm_target_name);
+ if (dm_target == NULL)
+ return ENOENT;
+
+ TAILQ_REMOVE(&dm_target_list,
+ dm_target, dm_target_next);
+
+ (void)kmem_free(dm_target, sizeof(dm_target_t));
+
+ return 0;
+}
+
+/*
+ * Destroy all targets and remove them from queue.
+ * This routine is called from dm_detach, before module
+ * is unloaded.
+ */
+
+int
+dm_target_destroy(void)
+{
+ dm_target_t *dm_target;
+
+ while (TAILQ_FIRST(&dm_target_list) != NULL){
+
+ dm_target = TAILQ_FIRST(&dm_target_list);
+
+ TAILQ_REMOVE(&dm_target_list, TAILQ_FIRST(&dm_target_list),
+ dm_target_next);
+
+ (void)kmem_free(dm_target, sizeof(dm_target_t));
+ }
+
+ return 0;
+}
+
+/*
+ * Allocate new target entry.
+ */
+dm_target_t*
+dm_target_alloc(const char *name)
+{
+ return kmem_zalloc(sizeof(dm_target_t), KM_NOSLEEP);
+}
+
+/*
+ * Return prop_array of dm_target dictionaries.
+ */
+prop_array_t
+dm_target_prop_list(void)
+{
+ prop_array_t target_array,ver;
+ prop_dictionary_t target_dict;
+ dm_target_t *dm_target;
+
+ size_t i;
+
+ target_array = prop_array_create();
+
+ TAILQ_FOREACH (dm_target, &dm_target_list, dm_target_next){
+
+ target_dict = prop_dictionary_create();
+ ver = prop_array_create();
+ prop_dictionary_set_cstring(target_dict, DM_TARGETS_NAME,
+ dm_target->name);
+
+ for (i = 0; i < 3; i++)
+ prop_array_add_uint32(ver, dm_target->version[i]);
+
+ prop_dictionary_set(target_dict, DM_TARGETS_VERSION, ver);
+ prop_array_add(target_array, target_dict);
+
+ prop_object_release(ver);
+ prop_object_release(target_dict);
+ }
+
+ return target_array;
+}
+
+/* Initialize dm_target subsystem. */
+int
+dm_target_init(void)
+{
+ dm_target_t *dmt,*dmt1,*dmt2,*dmt3,*dmt4,*dmt5,*dmt6;
+ int r;
+
+ r = 0;
+
+ dmt = dm_target_alloc("linear");
+ dmt1 = dm_target_alloc("zero");
+ dmt2 = dm_target_alloc("error");
+ dmt3 = dm_target_alloc("striped");
+ dmt4 = dm_target_alloc("mirror");
+ dmt5 = dm_target_alloc("snapshot");
+ dmt6 = dm_target_alloc("snapshot-origin");
+
+ dmt->version[0] = 1;
+ dmt->version[1] = 0;
+ dmt->version[2] = 2;
+ strlcpy(dmt->name, "linear", DM_MAX_TYPE_NAME);
+ dmt->init = &dm_target_linear_init;
+ dmt->status = &dm_target_linear_status;
+ dmt->strategy = &dm_target_linear_strategy;
+ dmt->deps = &dm_target_linear_deps;
+ dmt->destroy = &dm_target_linear_destroy;
+ dmt->upcall = &dm_target_linear_upcall;
+
+ r = dm_target_insert(dmt);
+
+ dmt1->version[0] = 1;
+ dmt1->version[1] = 0;
+ dmt1->version[2] = 0;
+ strlcpy(dmt1->name, "zero", DM_MAX_TYPE_NAME);
+ dmt1->init = &dm_target_zero_init;
+ dmt1->status = &dm_target_zero_status;
+ dmt1->strategy = &dm_target_zero_strategy;
+ dmt1->deps = &dm_target_zero_deps;
+ dmt1->destroy = &dm_target_zero_destroy;
+ dmt1->upcall = &dm_target_zero_upcall;
+
+ r = dm_target_insert(dmt1);
+
+ dmt2->version[0] = 1;
+ dmt2->version[1] = 0;
+ dmt2->version[2] = 0;
+ strlcpy(dmt2->name, "error", DM_MAX_TYPE_NAME);
+ dmt2->init = &dm_target_error_init;
+ dmt2->status = &dm_target_error_status;
+ dmt2->strategy = &dm_target_error_strategy;
+ dmt2->deps = &dm_target_error_deps;
+ dmt2->destroy = &dm_target_error_destroy;
+ dmt2->upcall = &dm_target_error_upcall;
+
+ r = dm_target_insert(dmt2);
+
+ dmt3->version[0] = 1;
+ dmt3->version[1] = 0;
+ dmt3->version[2] = 3;
+ strlcpy(dmt3->name, "striped", DM_MAX_TYPE_NAME);
+ dmt3->init = &dm_target_linear_init;
+ dmt3->status = &dm_target_linear_status;
+ dmt3->strategy = &dm_target_linear_strategy;
+ dmt3->deps = &dm_target_linear_deps;
+ dmt3->destroy = &dm_target_linear_destroy;
+ dmt3->upcall = NULL;
+
+ r = dm_target_insert(dmt3);
+
+ dmt4->version[0] = 1;
+ dmt4->version[1] = 0;
+ dmt4->version[2] = 3;
+ strlcpy(dmt4->name, "mirror", DM_MAX_TYPE_NAME);
+ dmt4->init = NULL;
+ dmt4->status = NULL;
+ dmt4->strategy = NULL;
+ dmt4->deps = NULL;
+ dmt4->destroy = NULL;
+ dmt4->upcall = NULL;
+
+ r = dm_target_insert(dmt4);
+
+ dmt5->version[0] = 1;
+ dmt5->version[1] = 0;
+ dmt5->version[2] = 5;
+ strlcpy(dmt5->name, "snapshot", DM_MAX_TYPE_NAME);
+ dmt5->init = &dm_target_snapshot_init;
+ dmt5->status = &dm_target_snapshot_status;
+ dmt5->strategy = &dm_target_snapshot_strategy;
+ dmt5->deps = &dm_target_snapshot_deps;
+ dmt5->destroy = &dm_target_snapshot_destroy;
+ dmt5->upcall = &dm_target_snapshot_upcall;
+
+ r = dm_target_insert(dmt5);
+
+ dmt6->version[0] = 1;
+ dmt6->version[1] = 0;
+ dmt6->version[2] = 5;
+ strlcpy(dmt6->name, "snapshot-origin", DM_MAX_TYPE_NAME);
+ dmt6->init = &dm_target_snapshot_orig_init;
+ dmt6->status = &dm_target_snapshot_orig_status;
+ dmt6->strategy = &dm_target_snapshot_orig_strategy;
+ dmt6->deps = &dm_target_snapshot_orig_deps;
+ dmt6->destroy = &dm_target_snapshot_orig_destroy;
+ dmt6->upcall = &dm_target_snapshot_orig_upcall;
+
+ r = dm_target_insert(dmt6);
+
+ return r;
+}